Find another way to relax. Nicotine is a relaxant, so you need to find a substitute to lessen your stress. A massage or yoga is a really great way of relaxing, or you could try a warm bath, or listening to your favorite music. Whenever possible, try to stay away from anything stressful during the initial couple of weeks when you stop smoking.
Take the money that you would usually throw away on your cigarettes and spend it on yourself on something that you really want. This is sort of like a reward for your hard work. Treat yourself to an expensive coat, a nice jacket or even that pair of shoes that you have been eying.